Microsolvation, aggregation, and pseudomonomolecular, ionic sp2-stereoinversion mechanism of two exocyclic β,β-di-tert-alkyl-α-arylvinyllithiums

The pseudomonomolecular (THF-catalyzed) rate constants kψ of cis/trans interconversion of the trisolvated, monomeric ground-states CIP and CIP' in THF via solvent-separated ion pairs (SSIP) can be measured through line shape analyses of the pairwise “coalescing” (averaging) NMR signals of diastereotopic 1H and 13C nuclei at positions 1/3 and 4/5.